Machine tools

ABSTRACT

The cutoff machine of the present invention is continuously operated to cut off successive ends of a metal bar, and said cutoff is effected through the use of a toothed circular saw cutter of a thickness at least one-half of the thickness thereof, as advised to be used by mechanical engineering handbooks, and rotating said toothed circular saw cutter at a speed in excess of that presently suggested in said handbooks whereby the saw is given rigidity and stiffness to accomplish the desired cutting off of a metal circular workpiece bar. Rotating said circular workpiece bar at a speed, again, considerably greater than the aforementioned engineering handbooks recommend and effecting a feed between the rotating toothed circular saw cutter and bar workpiece considerably greater than that presently recommended by the aforementioned engineering handbooks. This results in savings in waste material and a material reduction in time per piece produced.

United States Patent 1 1 3,598,005

[72] Inventor Donald S. Shale:- FOREIGN PATENTS Cincinmmr 238,272 4/l962Australia 82 101 1 1 pp 690327 332,207 7/1930 Great Britain... 82/48 1PM Dec-151967 735,185 5/1943 Germany 82/83 g m l 3 M C 332,307 7/1930Great Britain 82/48 ssignee a 11:5 anu unng ompauy Cindmufi Ohio OTHERREFERENCES c fi fi fi m f application Sen Catalog- Der Traub Automatcatalog 39 of 1963- 431,003, Feb. 8, 1965, now abandoned Pubhshed byHerman Traub Machlnenfabnk and dlstnbuted Continuation f application Senby Traub (USA) 1nc., South Terminal Dr1ve and Commerclal 4 795, 2, 19now abandoned St, Plainview L. 1., N.Y. 6 pages (Front & Rear Coverpagesand pages 3, 4, 6 and 9) I 54] MACHINE TOOLS PrimaryExjamimlz'lrxl-lgarrison L. Hinson 21 Claims,9 Drawing Figs. f=P v f?[52] US. Cl 82/46,

82/10 v 29/l04- 90/15 ABSTRACT: The cutoff machine of the presentinvention is [51] Int. Cl B231) 5/14, continuous, operated to cut offsuccessive ends of 3 meta] 82% 3/04 bar, and said cutoff is effectedthrough the use of a toothed Field oISearch 82/25,46, circular Sawcuneiof a thickness at least one ha|f of the 47,501 102-2514 3'90?thickness thereof, as advised to be used by mechanical en- 143/4, 59;4/242; 90/1 gineering handbooks, and rotating said toothed circular sawcutter at a speed in excess of that presently suggested in said [56]Roi-"mm Cited handbooks whereby the saw is given rigidity and stiffnessto UNITED STATES PATENTS accomplish the desired cutting off of a metalcircular workl,098,l67 5/1914 Potter 82/98 piece bar. Rotating saidcircular workpiece bar at a speed, 1,698,250 111929 Adams 82/89 again,considerably greater than the aforementioned engineer- 2,301,028 1 l/1942 Esch 90/15 ing handbooks recommend and effecting a feed between the2,811,884 11/1957 Jones 82/2.5 rotating toothed circular saw cutter andbar workpiece con- 3,118,333 l/1964 Pilcher et al. 82147 siderablygreater than that presently recommended by the 3,264,911 8/1964 Crider82/4 aforementioned engineering handbooks. This results in 2,022,433 I1/1935 Roemer.... 29/103 savings in waste material and a materialreduction in time per 2,356,038 8/ 1944 Edwards 82/90 piece produced.

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3 l 7 223 L g Patented Aug. 10, 1971 4 Sheets-Sheet 1 Ilvl-ll INVENTOR.

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Patented Aug. 10, 1971 4 Sheets-Sheet 2 0 a 7 a I /w 0 I a M A L ///V/INVENTOR. Do vgL D 5. 5114/: R

MACHINE TOOLS This application is a continuation-in-part application ofthe application of Donald S. Shafer for Machine Tools, filed Feb. 8,I965, Ser. No. 431, 003, and further, is a continuation application ofthe application of Donald S. Shafer for Machine Tools filed June 2,I965, Ser. No. 460,795 both now abandoned.

SUMMARY OF THE INVENTION A principal object of this invention is theprovision of a cutoff machine wherein the resultant individual piecesfrom bar stock, solid and tubular, are considerably less in cost thansuch cutoff pieces as produced by heretofore known machine tools tion,are more accurate in size and more readily and accurate- I ly furthermachinahle than the pieces produced heretofore.

A further object of the present invention is the provision of a machinetool and the method of operating same whereby tools may be employed thatresults in considerable savings in material while at the same timeproducing said cutoff pieces, slugs, at an exceedingly rapid rate and ina condition more readily usable.

In a very broad sense, the machine tool of the present invention may belikened to what is known as a "Screw Machine," since such machines arecapable of producing cutoff parts in succession from bar stock, whetherfrom a single or plurality of said bar stock, and with the said barstock being advanced with respect to the machine tool, substantially assoon as the preceding cutoff has been completed.

Other objects and advantages of the present invention should be readilyapparent by reference to the following specification considered inconjunction with the accompanying drawings forming a part thereof and itis to be understood that any modifications may be made in the exactstructural details there shown and described, within the scope of theappended claims, without departing from or exceeding the spirit of theinvention.

In the drawings:

FIG. 1 is a side elevational view of a machine tool embodying theimprovements of the present invention. I

FIG. 2 is a top plan view of the machine shown in FIG. 1.

FIG. 3 is a transverse view through the machine as seen from line 3-3 onFIG. I.

FIG. 4 is an enlarged sectional view through a portion of the machine,showing a detail thereof, as seen from line 4-4 on FIG. 3.

FIG. 5 is an enlarged sectional view through the tools cross slides asseen from line 5-5 on FIG. 3.

FIG. 6 is a plan or elevational view of a typical cutoff tool or sawblade as employed with the machine of the present invention and forminga detail of the present invention.

FIG. 7 is a view of hydraulic and electric circuits or diagrams involvedin this machine in a substantially complete operation.

FIG. 8 is a transverse sectional view through the machine on line 8-8 onFIG. 1..

FIG. 9 is a perspective view ofa chip from the machine of the presentinvention, many, many, times enlarged.

Throughout the several views of the drawings, herein above set forth,the same or similar reference characters are employed to denote the sameor similar parts.

While, as above intimated, the present machine operates in somewhat asimilar manner with that of a screw machine, since said screw machineeffects various operations on the end of a bar stock, such as forming,drilling, reaming, and the like, with the final operation being that ofcutting off the said formed part, or end, of the said bar stock. Thepresent machine will be described with relation only to the cutoff ofthe end of the bar stock, advancing the bar stock and subsequently againcutting off the bar stock until the entire bar stock has been cut.

It should also be noted that the transversecross section of the barstock may have any form in elevation such as round, square, hexagonal,and the like, and at the same time may be either solid or hollow, as inthe form of a tube. It should further be noted that if the bar stock issolid the cutting off must be continuous until the center or axis of thebar is reached, while if the bar stock is hollow or tubular the cuttingoff tool need penetrate only to the inner face of the bar stock hollowcenter.

Specifically, as disclosed in the drawing, use is made of a suitablesupport or bed 10 generally hollow and within the interior of whichvarious parts, or suitable subassemblies, of the machine tool may bedisposed. Supported on said bed at one end thereof is the head orheadstock II having enclosing walls, such as end walls 12 and I3 andinwardly of the said end walls 12 and 13, respectively, project bearingbosses I4 and 15. The bearing bosses l4 and 15 are in axial alignmentand provide or enclose hearings in which is mounted a work rotatingspindle 16. The spindle I6 is hollow and is secured in place against endwise or axial movement through suitable securing means [7 and I8.Associated with the spindle-securing means or member I8 is a collet I9which is periodically opened to pennit the advancement of the bar stock20 and for im mediately securing the said bar stock in each position ofad vancement. The bar stock 20 shown in the drawings being cylindricaland solid in cross section.

The bed 10 is provided at its upper surface with a bed plate 21 havingupstanding therefrom and extending from substantially one end of thesupporting bed and its bed plate is a bearing block 22 on which ismounted, for adjustment toward and from the head I], an adjustable stopsupporting slide 23. The bearing block 22 is provided longitudinallythereof with a guiding groove 24, dovetailed in cross section, receivinga depending guiding tongue 25 similarly dovetailed in cross section. Anysuitable or desirable means may be employed for adjusting the slide 23and locking same in operative position. In the present instance theslide 23 is manually adjusted by manually engaging and moving the sameand then locked in adjusted positions by means of clamp screws 26extending along the side of the slide and impinging on the upper surfaceof the bearing block 22 laterally of the dovetailed guide groove 24therein.

Secured to the adjustable slide 23, at the end thereof nearer the headll,.is a stop 27 which engages the inner, or adjacent end of the barstock 20 for positioning it accurately with respect to the cutoff toolor tools, as will presently he described.

The spindle 16 is adapted to be rotated as is the bar stock centrallythereof and for which purpose the spindle 16 has keyed or otherwisesecured thereto a pulley 28 about which is trained a driving belt 29, inturn, extending around a pulley 30 on the motor shaft 31 outwardlyprojecting from an electric motor 32 which is ofa variable speedconstruction and wherefore the spindle and bar stock may be rotated atdifferent speeds. The speed or r.p.m. of the motor and work rotatingspindle is, of course, related to the diameter of the bar stock beingworked on, since, it is obvious, that bar stock of various diameters maybe used or worked on.

A second slide supporting block 33 upstands from the bed plate 21substantially adjacent the inner end of the stop supporting slide 23with said block 33 having formed downwardly of its upper or slidingsurface 34 a dovetailed guiding groove 35. It should be noted that thesaid guiding groove 35 extends for the full length of the supportingblock 33.

Mounted on the sliding surface of the slide block 33, and extendinginwardly of, approximately, each end thereof is a cross slide 36 and 37which are substantially similar to one another with said slidesrespectively having projecting therefrom a dovetailed guide 38 and 39disposed in the transverse slide block groove 35.

The cross slides 36 and 37 are each in turn, provided with a tool slide40 and 41 each having a downwardly projecting dovetailed guiding tongue42 and 43 and respectively disposed in a dovetailed guideway 44 and 45formed in the said cross slides 36 and 37 downwardly of their uppersliding surfaces. Secured on each tool slide 40 and 41 is a bearingblock 46 and 47, respectively, rotatably supporting a tool spindle 48and 49. The said bearing blocks 46 and 47 are secured in any suitable ordesirable manner to its tool slide, as by clamp screws 50 and 51,extending through a laterally projecting portion of bearing blocks 46and 47, see FIG. 3. The said tool slides are adjustable in thedovetailed guideways and as shown in the drawings the said adjustmentmay be effected by manually grasping the same and after adjustment tothe desired position are secured in operative position by clamp screws52 and 53 respectively carried by the cross slides 36 and 37 forimpinging against the tool slides depending guide tongues 42 and 43, seeFIG. 4.

As seen in FIG. 2 each of the tool spindles 48 and 49 has outwardly ofits bearing block one portion 54 and 55, respectively, ofa universaljoint, respectfully, indicated in its entirety by the reference numeralsS6 and 57. The second portions 58 and 59, respectively, of the universaljoints 56 and 57 has extending therefrom a driving member 60 and 61 withwhich is respectively telescoped at 62 and 63 a driven sliding bar 64and 65, respectively keyed at their sliding joint with their respectivedriven part and with each driven bar 64 and 65, at its outer end,carrying one part 66 and 67 of a second pair of universal joints,respectively, indicated in its entirety by the reference numerals 68 and69. The companion or second part 70 and 71 of the universal joints 68and 69 are, respectively, secured to a motor shaft 72 and 73 of variablespeed electric motors 74 and 75. The said motors 74 and 75 arerespectively secured to the upper surface of the bed plate 21 andlaterally of the slide supporting and bearing block 22, as seen in FIG.2.

Each of the tool spindles 48 and 49 has secured thereto an operatingtool which, in effect, simultaneously operates on the projecting end ofthe bar stock 20. As seen in the drawings the tool spindle 48 hassecured thereto a pair of cutoff saws, respectively, indicated by thereference numerals 76 and 77 while the tool spindle 49 has securedthereto a single cutoff saw 78. it should be noted that this arrangementis such that it can be reversed or each tool spindle carry but a singlesaw or each tool spindle carry a pair of saw or even more, as the natureof the work permits.

It should be also understood that a machine including a sin gle spindleand therefore a single tool or cutoff saw may be employed as whencutting lengths of hollow workpieces.

The saws are secured to their respective spindles in a relation to oneanother that they finish or complete their opera tion in succession,that is, if two or more saws are employed on the spindles the innermostportion will first be cut from the outer or free end of the work stockor bar and successive portions will be successively out toward theheadstock, The said saws are secured in operative relation to oneanother through bushings 79, respectively, on the tool spindles 48 and49 and which bushings space the saws that the resulting portion betweensaws is of identical length.

Specifically, the tool spindle 48 has a bushing 80 from the bearing 46to its first saw 76 and since the work stock, as will presently be madeclear, is in alignment with the inner end of the said bearing 46 thebushing 80 represents the length of the first portion 81 of the barstock being removed or severed from the end thereof, The first saw 78 onthe spindle 49 has a bushing 82 thereon which extends between the innerend ofits supporting bearing 47 and itself, the said saw 78, thereon.This bushing 82 is double the length of the bushing 80 plus thethickness of the saw 76 wherefore the second section or por tion 83 fromthe end of the bar stock will be of the exact length as the firstsection 81 from the end thereof. Mounted on the tool spindle 48 is asecond bushing 84 which is equal in length to the bushing 82 and istherefore twice the length of the bushing plus the thickness of the saw78 and the third section or portion 85 of the bar stock being severed isagain of the same length as the two sections or portions 81 and 83previously cut or removed from the'bar stock.

in order to effect this operation without difficulty or sticking of thesaws and the bar stock end sections, the said saws 76, 78 and '77decrease in diameter wherefore the bar stock first section or endportion 81 is first severed from the bar stock by the saw 76 whereuponthe second bar stock section or portion 83 is severed from the bar stockby the saw 78 and finally followed by severance of the third section orportion 85 of the bar stock through the action of the saw 77. The sawsare clamped on their respective tool spindles through a final makeupbushing section 86 and 87 against which the clamping nuts 88 and 89engage through the threads on the ends of their respective toolspindles.

The tool slides are adapted to be actuated toward and from one anotherand toward and from the work, bar stock, by any suitable or desirablemeans. There is disclosed in the drawing a means for effecting acomplete operative cycle and which means will be subsequently describedin detail.

it is desirable, in some instances, essential, as will later be madeclear, that a liquid coolant be supplied to the cutoff tools and workwhile the said work is being cutoff. Obviously, any suitable ordesirable mechanism may be utilized for this purpose, such for example,as disclosed in the drawings and particularly in HO. 8.

As shown in FIG. 8 use is made of a coolant supply tank 217 disposedwithin the bed 10 and preferably mounted on a bracket 218 carried by oneof the bed sides to project inwardly thereof. Extending across the topof the tank 217 is a platform 218 on which is mounted a suitable motor219. The motor 219 has connected therewith a pump 220 which has an inlet22 and an outlet 222.

The coolant pump is such that it will develop sufficient pressure withinthe discharge 222 to raise the said coolant to a point substantiallyequal to the total height of the bed. The said pump discharge 222therefore has connected with it a pipe 223 which terminates at its otherend in a pair of nozzles 224 and 225 and which nozzles are disposeddirectly above the point of contact of the work and cutoff tools.

The said nozzles 224 and 225 are each connected through a distributorpipe 226 with the main supply pipe 223. Each of the nozzle supply pipeshas therein a shutoff and regulating valve, respectively, indicated bythe reference numerals 227 and 228. The said valves 227 and 228 not onlycontrol the rate of flow through their respective nozzles 224 and 225but are also employed to shut off one or the other of said nozzles inthe event that a single cutoff saw is employed or a plurality of cutoffsaws, each on one or the other of the tool spindles 48 and 49.

The fluid coolant when liquid, that is water, oil, or the like, afterpassing the saw and work piece is collected, in what may be termed, acoolant catch basin 229. The catch basin 229 is connected by a pipe 230to the coolant tank 217 for recirculation. Obviously a cenain amount ofchips are carried with the coolant through the catch basin 229 andreturn pipe 230 into the coolant tank 217 and these chips and otherforeign objects are screened before the coolant is again circulatedthrough the system.

From the foregoing it will be noted that both the workpiece and tool,circular disc having a serrated periphery, are power rotated during thecutoff operation and which function, tool and workpiece rotation, is theheart ofthe present invention in the production of cutoff parts whetherof some length or of extremely short length, such as, in the productionof what is generally termed a slug." Slugs may be solid pieces fromsolid bar stock of an elevational cross section of round, hexagonal,square, or any regular or irregular cross section so long as it can befed through the driving or rotating spindle to a given point or stop andthen clamped in position during cu toff. Slugs may also be hollow, liketubing, regularly round or of any cross section, supra, and have anopening axially, or

otherwise, thereof and again of any desired outline or cross sectionplan which can be fed through the driving or rotating spindle to a givenstop and then clamped in position during cutoff. The slugs aresubsequently further processed in the production of an article bymethods having no relation to the present machine or to one another. Inother words, one such slug measuring seven sixty-fourths inch thick and1 1 1/16 inches in diameter, cut from a solid aluminum bar, issubsequently stamped and extruded as a can including its one end andvertically disposed walls and having the capacity of 12 fluid ounces.Similar slugs of steel are likewise formed or ex truded to provide asteel can or other parts.

As noted above the principal object of the present invention is theproduction of these, and other, parts in an expeditious manner and at acost well below that of any method heretofore known. At the same time,and as is well known, the production of the parts by machine tools andmethods heretofore known frequently resulted in the said part beingextremely difficult to further process. This difficulty resulted fromthe fact that the 2 slug or other part, out from the bar stock duringthe cutting off thereof, generates such heat that the subsequent coolingof the cutoff part resulted in a hardened condition requiring that thepart or slug be annealed before the subsequent processes could beperformed thereon. At the same time the said slugs were frequentlydiscolored due to the heat generated during their cutoff process andwhich discoloration rendered the eutoff parts unacceptable for furtheruse until such discoloration was obliterated.

Each and every one of these disadvantages are overcome in the presentmachine due, as noted above, to the rotation of the work, bar stock, andthe rotation of the cutoff tool, saw. Furthermore by the presentinvention a relatively extremely thin circular saw blade is employed andin some instances the said saw blade may be nothing more than a circulardisc ofthe saw material with no peripheral teeth. Specifically howeverit is desired that the saw or cutoff tool have teeth and preferably theteeth by similar to those for cutting a screwdriver slot in the end of ascrew, bolt, or the like. There is illustrated in FIG. 6 of the drawingsa typical or acceptable cutoff tool or cutter of the saw type.

As was noted above the saws or other cutoff tools as employed herewithhave a thickness which rarely exceeds thirtytwo thousandths of an inch.The only heretofore known similar device or tool for cutting purposeswas an abrasive disc of a width several times the width of the cutoffsaws of the present invention. From this it follows that the savings inmaterial, in view of the kerfs from the cutoff tools, as heretoforeknown and the applicants cutoff tool or saws, it considerable even overabrasive discs.

By the present invention, and depending somewhat on the material beingworked on, use has been made of cutoff saws from six-thousandths of aninch to thirty two thousandths of an inch in thickness with nodifficulty in producing hundreds and even thousands of parts from eachsaw.

In operation, the machine of the present invention has produced cutoffpieces from bar stock and in which the surface speed, for ferrousmetals, range between 900 f.p.m. to speeds of, and in access of, 1,200f.p.m., while with nonferrous metals the surface speeds varied between7,165 f.p.m. to 21,000 f.p.m..

With the surface speeds as hereinabove set forth the cutoff parts orslugs had their surfaces absolutely parallel to one another, had theirsurfaces free of any discoloration due to friction heat, and were insubstantially the identical condition of hardness as the bar stock fromwhich they were cut and for which reasons the said parts, particularlyslugs, could be immediately further processed.

Specifically, and as noted above, the cutoff saw in FIG. 6 has a bodyportion 90 centrally of which is a passageway or aperture 91 ofa sizedepending on the size of the arbor or tool spindle on which it ismounted. Extending from the aperture or central opening is a keyway 92for locking the saw on its arbor or spindle against relative independentrotation. As

noted above the saw body is provided with peripheral teeth 93 which mayand preferably do take the form of the teeth usually employed with ascrewdriver slot cutter.

It should be noted however that the results obtained from the machinetool of the present invention is not dependent en tircly on the abovespecifically identified saw teeth since, results have been obtained fromcutting discs with no saw teeth but merely through action of thefriction between the cutter and bar and with such cutoff parts havingnone of the objections thereto usually resulting from the employment ofmachines and methods heretofore known and used.

The speed of rotation of the cutter results in each tooth of the cutter,cutting saw, being in contact with the material an exceedingly brieftime, as will presently be made clear, This short or brief time ofcontact is such that there is substantially no transfer of heat fromeither the chips or its parent metal into the cutter tool. This resultsin eliminating the chiefreason or factor on tooth wear and or distortiondue to heat, and thereby contributes to long life for the cutter.

In order to more fully understand this nontransfer of heat, assuming thecutting saw has 72 teeth, it is believed the following formula willapply:

Nm r.p.m. X Nc in which:

Nm teeth contacting workpiece per minute Nc number ofteeth in cutter andin which:

Nm 10,000 X 72 therefore Nm 720,000 and considering 60 seconds perminute the following result is obtained:

720,000/60 (sec.) 12,000 teeth per second strikes and removes a chipfrom the work.

In view of the foregoing and in cutting off a slug 1 inch in diameter inl second of time and using a 0.032-inch thick cutter, 3 inches indiameter, approximately 0.025 cubic inches of material is removed in thesaid second.

From the foregoing the following formula follows:

(I chip load per tooth and wherein, in view of the above example with12,000 cutter teeth striking the work per second, each cutter toothremoves approximately 0.0000021 cubic inches chip load per tooth ofmaterial. The removal of this small volume of material per toothpractically eliminates burrs which are formed by pressure of a toothattempting to take a relatively large chip, as is the conventionalpractice. Also, due to the extremely 'smallsize of the chips whichresults means there is no need for high torque and horsepower valves inthe cutter rotating mechanism and work.

The cutting operation as above set forth is done with a tooth or sawthat has no set to the teeth nor do the individual teeth have any reliefor clearance whatsoever on the sides thereof for chip clearance. In thisrespect attention is called to FIGS. 1, 2 and 6 wherein the saws haveparallel sides with teeth having their sides in the same plane as thesides of the teeth.

While a relatively specific arrangement of coolant to the tool and workhas been set out above it should be noted that almost any fluid, whichincludes gaseous, lubricant may be used in this part of the machine andmode of operation of the present invention. The liquid lubricant is usedto eliminate the tendency of the sides of the cutter, revolving as itdoes to such high speeds relative to and in combination with the speedof the work, for preventing this said speed to develop friction thatcould readily weld the cutter and material being cut to one another.

When the cutter is rotated in a direction contrary or opposite to thedirection of rotation of the workpiece each tooth on the cutter formsthe function of introducing the coolant or lubricant into the slot ortrough being made and ahead of it for thereby, in effect, lubricatingthe cutter path and at the same time carrying with it the cooling effectof the coolant or lubricant. This operation, in effect, is, it may besaid, by a osmosis action. Also. the cutter while rotating at the speedsabove indicated causes, due to the centrifugal force thereon, the cutterto be stiffened and wherefore cutters as thin as 0.006 inches, supra,may be employed in this work.

it has also been found that due to the speed of rotation. of both thecutter and the work and the holding of friction heat to a minimum theslugs are produced with end surfaces that seem to be polished and withno discoloration whatsoever therein nor is the normal hardnesscharacteristic in the slug in any wise changed. No cutoff processheretofore known produces this result.

To more clearly understand the foregoing it should be noted that workspeeds given or recommended for materials in handbooks are greatlyexceeded by the process and the mechanism of the present invention. Forexample, the handbooks or textbooks set forth the machineability of SAEl l 12 steel. as rotating 165 surface feet per minute and the feed ofthe work to the tool is recommended as 0.002 inches per revolution. Thesame material in the machine of the present invention and using themethod herein set forth, the rotating cutoff tool method, machines at arate of at least 900 surface feet per minute and a feed rate of at least0.0l inches per revolution of work is'utilized for thereby reducing thetime required to cut off each workpiece.

Another example of the terrific difference between the present inventionand that heretofore known, SAP. steel 4027 by the textbooks or handbooksshould have a cutting off rotating speed or surface speed of45 feet perminute together with a feed of0.00l ofan inch pcrrevolution and akerfoflllloll of an inch, while with the machine and method of thepresent invention the cutting speed was 423 surface feet per minute anda feed of 0.0l55 inches per revolution and a kerf of 0.032 of an inch.

A still further example of the difference between the previouslyaccepted standards and that obtained by using the process and machine ofthe present invention, the material employed was 6061 F aluminum andwherein the cutting speed heretofore accepted was 450 feet per minutewith a feed of 0.002 inches per revolution and using a cutter having akcrf Y of 0.062 of an inch. As distinguished from this, in machining theabove noted aluminum, the machine and process of the present inventionutilized a cutting speed of 4,436 feet per minute and a feed of 0.0226inches per revolution with a cutter kerf of 0.032 of an inch in view ofthe large number of materials cut off by the present method and machinenu merous examples could be set forth but, it is believed, with theforegoing and the following examples the complete range of the presentmachine will be fully understood.

On free-cutting yellow brass and utilizing a work bar stock 1 inch indiameter the handbooks recommend for cutting off slugs or pieces that acutting speed in feet per minute should be 906 with a feed of 0.0035inches per revolution and a saw having a width and leaving a kerf of0.062 inches. With the present machine and method of cutoff as hereindisclosed a cutting speed of 4,965 feet per minute and a feed of 0.012inches per revolution with the cutoff saw having a kcrf of 0.032 of aninch.

With such material as tough pitch fully annealed electrolytic 25 to +02.silver per ton white pine copper the standard handbooks recommend acutting surface speed of 60 feet per minute, a feed of 0.00l of an inchper revolution and a cutting off saw leaving a kerf of 0.062 of an inch.With this material and a workpiece bar stock lVainc'hes in diameter themachine and method of this application rotated the said workpiece at acutting surface speed of2,88o per minute and a feed of 0.0] 38 inch perrevolution and using a cutoff saw giving a kerf of 0.032 inch.

As a matter of fact relatively small diameter cuttingoff tools such asburrs as used in dental work and having a serrated diameter of 0.5 inchhave been employed at a rate of 450,000 rpm. and with the workpiece orstock of a very small diameter such as exceedingly hard wire, frequentlyreferred to as piano wire, rotated at a speed in the category of thatherein above set forth with excellent result in so far as maintenance ofoverall dimension, surface finish as hereinafter set forth, and savingin material are concerned.

With the tool, cutoff saw, and the work operating at the speeds hereinabove set forth the resulting chips were, to the touch, very fine-andpowdered. A close examination under a power microscope disclosed thechip to have a formation which is basically similar to a quarter moonand illustrated in the drawings in FIG. 9. The said chips have a widthequal to the width of the cutter, saw, being used and a lengthdetermined by the time the cutter tooth was in contact therewith andwhich resulted in the said chip having the said shape of a quarter moon"with extremely thin ends.

it has been found that with the speeds as above set forth the desiredlength of workpieces is as it should be and that the finish on the endsof each workpiece whether steel, aluminum. brass or copper, such as theexamples set forth above had a finish that was surprising to say theleast. A test of the said finishes indicated that they were within ID to60 microinch finish, some ends of the various materials even seeming tobe polished.

From the foregoing, and in view of experiments in highspced machiningthe following was disclosed,

a. an incredible increase in tool life,

b. the length size of the slugs produced were exceedingly accurate, thatis, there was practically no measurable differences between successivecutoff pieces or slugs.

. cutting at rates above indicated, from 900 surface feet per minute to2 l ,000 surface feet per minute for the average material and includingfor exceedingly small diameter materials, a speed of 450,000 r.p.m.,enormous and tcr rific amounts of metal are removed with the use of flatblade and since at these speeds the, what may be con sidercd extremelythin, cutoff tools, saws, an enormous amount of stock is saved since, asnoted above, the width or kerf as employed in the present application isapproximately one-half that which was considered acceptable prior to thepresent application.

As further noted above any means commensurate with the spirit of thepresent invention may be employed for operating the tools and work, barstock, during the cutting off operation. One such complete cyclicoperating mechanism is disclosed diagrammatically in FIG. 7 which is tobe read in conjunction with certain of the other Figures.

In order that the said saws, or other cutoff tools, may effect theirproper and specific operation, the cross slides 36 and 37 haverespectively depending therefrom arms 94 and 95 which pass through anopening 96 downwardly and longitudinally of the cross slides supportingblock 33. The said arms 94 and 95 are respectively secured to the ends97 and 98 of hydraulically actuated piston rods outwardly projecting,respectively, from cylinders 99 and 100.

As will presently be obvious, the cross slides 36 and 37 are actuatedtoward one another and as will be presently set forth the first slide tocomplete its final operation will be automatf cally retracted.Specifically, and as shown in the drawings, this will be the slide 37since, while slide 36 effects the first cutoff operation through its saw76 it still has to further travel until the saw 77 completes itsoperation, but since saw 78 will complete its operation prior to that ofthe saw 77 the slide 37 will have completed its work cycle of operationprior to the completion of the work cycle of the slide 36 and willreturn to its normal inoperative position, and remain there while theslide 36 completes its work cycle and returns to its normal in operativeposition.

The hydraulic means or circuit for effecting the cyclic operation of thesaid tool slides 36 and 37 is illustrated in FIG. 7 and wherein thepiston rods 97 and 98 are illustrated as respectively connected topistons 10] and 102 respectively in the cylinders 99 and 100. The saidcylinders are each, respcc' lively, closed at one end by the head I03and I04 with the other ends of said cylinders normally open butrespectively closed by heads )5 and X06 and each head provided with anaperture through which the piston rods 97 and 98 reciprocate to effectthe sliding movement of the cross slides 36 and 37 through the dependingarms 94 and 95.

In view of the fact that the diameter of the bar stock 20 may vary fromsetup to setup or the diameters of the cutoff saws may vary and therebyrequiring more or less travel of the said cross slides 36 and 37'use ismade of a variable stop to limit the outward movement of the cross slideand which variable stop is conveniently in the form of a stop screw 107and 108 respectively threaded through the rear vertical wall and thefront vertical wall of the bed and with said screws secured in adjustedpositions by lock nuts 109 and 110 thereon.

It is in this position of the parts that a cycle of operation takesplace, and which complete cycle of operation, including the electricalcontrols therefore, is as follows:

Disposed within the hollow interior of the bed 10 is a sump or tank 111on and above which is an electric motor 112 connected with, to be driventhereby, is a hydraulic pump 113. The pump 113 has depending therefrom asuction pipe or conduit 114' which enters the tank 111 to be below theupper level of the hydraulic medium disposed in the said tank 111.Outwardly extending from the pump 113 is a feed or pressure pipe orconduit 114 having therein a pressure-controlling valve 115, adjustableto the desired operating pressure for the system. Extending from theregulating valve 115 is a pipe or conduit 116 that extends to the sumpor tank 111. Extending from the pressure line or conduit 114 is a branchpressure line or conduit 117 that terminates in the main control valveindicated in its entirety on FIG. 7 by the reference numeral 118.

Themain control valve 118 comprises a valve sleeve 119 through which isformed apertures I and 121 with which is connected the outlet or branchends of a Y-member 122.

The valve sleeve 119 is further provided with apertures 124, 125. I26,127 and 128, with certain of said apertures on each side of the inletapertures I20 and 121 and with which said apertures. 124-128, isconnected the ends of other pipes or conduits as will presently be madeclear.

Disposed within the main valve sleeve 119 is a spool-type valveindicated in its entirety by the reference numeral 129 and including astern 130 on which is formed spool or land portions 131, I32, I33 and134 having between the said spool or land portions spaces or cannelures.The spool-type valve 129 is adapted to be axially shifted so as toconnect through the various spaces or cannelures the valve sleeve portsor openings. With the starting valve in the position illustrated thehydraulic fluid, usually oil, in pressure line 114 is cut off from themachine and merely passes. through the control or pres sure regulatingvalve 115 to the return pipe or conduit 116, to the sump or tank 111.

Each of the cross slides piston and cylinder mechanisms, 99IOI and100-102, is provided with its own control valve indicated in thedrawings, respectively, by the reference numerals 135 and 136.

Each of said cross slide control valves I35 and 136 is substantiallyidentical to the other with the control valve 135 including a valvesleeve 137 through which is formed apertures I38, I39, I40, I41, I42 and143. Disposed within the valve sleeve 137 is a spool type valveincluding spool portions or lands 144, I45 and 146' having between themreduced portions or cannelures I47 and 148. Within the valve sleeve 137but outwardly of the spool or land portions 144 and 145 there areprovided cannelures or reduced portions 149 and 150. The spool portionsor lands are connected with one another by a valve stem 151 whichprojects outwardly of the closed ends of the valve sleeve I37 andrespectively act as cores for solenoids to be subsequently described.

The control valve 136, as noted above, is substantially identical withthe control valve 135 and includes a valve sleeve 152 through whichextends, to the interior thereof, apertures 153, I54, 155', I56, I57 and158. Disposed within said valve sleeve 152 is a spool-type valveincluding spool or land portions 159, I60 and 161 respectively connectedwith one another in spacedapart relations by a valve stem 162 to providebetween the said spool portions 159 and 160, and 160 and 161,respectively, cannelures 163 and 164. Outwardly of the spool or landportions 159 and 161 and the adjacent closed ends of the said valvesleeve 152 are cannelures I65 and 166. The valve stem has its oppositeends 167 and 168 outwardly projecting from the valve sleeve and closuresto act as cores for electrical solenoids, as will presently be madeclear.

As was noted above, the pressure pipe or conduit 114 through the branchpipe or conduit I17 terminates in the Y- member 122 with the stemthereof connected with the said pressure pipe or conduit 114 while theY-branches respectively connect with ports I20 and 121 in the maincontrol valve sleeve 119. The said main control valve sleeve 119 hasconnected with its port 126 a pipe or conduit 169 connected with a pipeor conduit 170, from one end of which extends a pipe constituting thestern ofa Y-membcr 170 which includes thc Y-member branches,respectively, indicated by reference numerals I71 and 172. The said Ymembcr 170 has its arms or branches 171 and 172 respectively connectedwith the cross slide control valve sleeve ports I40 and 141. Extendingfrom the other end of the pipe or conduit 170 is a pipe or conduit I73again forming or constituting the stem ofa Y-mcmber 175 which has itsarms I76 and 177 connected with the ports I55 and 156 of the slidecontrol valve sleeve 152.

The remaining ports I25 and 127 of the main control valve sleeve haverespectively connected therewith pipes or conduits 178 and 179 which,respectively, terminate in a pipe or conduit I80 and 181v The pipe orconduit has extending from its one end a pipe or conduit 182 thatterminates in the port 138 of cross slide control valve sleeve port 138and the pipe or conduit 180 has extending from its other end a pipe orconduit 183 that terminates in the port 153 of cross slide control valvesleeve 152. Similarly, the pipe or conduit 181 has extending from itsopposite ends pipes or conduits I84 and with said pipes or conduitsterminating, respectively, in cross slide control valves I35 and 136with the pipe or conduit 184 being connected with valve sleeve I37 andpipe or conduit 185 being connected with valve sleeve 152.

The main control valve sleeve 119 has connected with its ports I24 and128 pipes or conduits 186 and 187 which extend from a pipe or conduit188 that terminates in the sump or tank 111. Ports I39 and 142 of slidecontrol valve sleeve I37, and the similar ports I54 and 157 of controlvalve slide sleeve 152 have respectively connected therewith pipes orconduits 189, I90, 191 and 192 of which pipes or conduits 189 and 191,respectively, connect with one end of cylinders 99 and 100 of thepistons I01 and 102 for moving the cross slides toward each other, whilethe pipes or conduits I90 and 192 are connected with said cylinders 99and 100 on the other side oftheir pistons 101 and 102.

The maincontrol valve 118 is shown in FIG. 7 in its neutral or stopposition and wherefore the pressure in the pipe or conduit 114 isblocked by the said control valve. As noted above the said main controlvalve member has its stem outwardly projecting from one end ofits sleeve119 to act as a core for an electric solenoid coil 193 which hasextending from one end thereof a wire 194 that is connected to a maincircuit wire 195 of a three-wire system and which three-wire system alsoincludes wires I96 and 197. It should be noted that the wires I95 and196 together constitute a circuit going back to an electric circuitsupply source while wires 196 and 197 likewise form a circuit from theelectrical current source. The usual electrical potential across thewires I95 and 196 and 196 and 197 is 110 volts while the wires 195 and197 together constitute a circuit of 220 volts and is usually used forrotating the motors ofa machine tool assembly.

The solenoid coil 193 has its other end connected through a wire 198with the center wire 196 of 220-volt circuit for thereby supplying thesaid solenoid coil 193 with l H) volts of current. Disposed in said wire198 is a spring-loaded manually actuatable switch 199 which includes aself-energizing mag nctic latch 200 (conventially shown in FIG. 7) andwhich an tomatically opens when no current is flowing through the lineor wire 198.

From the foregoing, and as particularly seen in FIG. 7 the closing ofthe manual switch 199 through its manually engageable pushbutton closesthe circuit that includes the current source wires 195, connecting wire194 to the solenoid coil 193, the wire 198 from the other end of thesolenoid back to the wire 196 of the main electrical circuit andincluding the switch 199 and latch 200 for latching or holding theswitch 199 in operative position.

This current flow energizes the solenoid coil 193 and through the mainvalve stem acting as the solenoid core actu ates the main control valve129 relative to its sleeve 119 and against the resistance of a spring201 which tends to resist the main valve movement as well as return sameto its normai position after the completion of a complete cycleofoperation as will subsequently be made clear. The shifting of the mainvalve member 129 to its second position connects the hydrau lic pumppressure line 114 through its Y-connection 117, and main control valve118 to and with the pipes or conduits 169 and 170 and therebysimultaneously with the cross slides con trol valves 135 and 136. Sincethe slide control valves 135 and 136, particularly the stems 149 and162, are at this time in the position to connect the pressure in thepipes or conduits 169 and 170 through its end branches 170' and 173 andthe pipes or conduits 189 and 192 the pistons 101 and 102 are actuatedin directions to actuate the cross slides to cause the tool slidesthereon and their saws to approach and penetrate the work, bar stock,effect the severance therefrom of the bar stock sections, all above setforth.

In view of the fact that the work and tool are rotating so rapidly, ashereinabove set forth. the pressure control valve 115 is set to obtain afeed of 0.0l inches per revolution of the work, bar stock, when steel isbeing worked on while said feed for nonferreous metals such as aluminumthe feed rate would I be 0.045 inches per work revolution. This movementof the slides continues until, as noted above, the slides have completedtheir work and are returned to their normal retracted positions.

As noted above the tool slides are stopped upon the same reaching theirultimate inward positions, that is, after each tool side, depending uponthe number of saws thereon, has cut its number of portions from thework.

As further noted above the tool slide 36 will complete its work first,and is provided at the inner end thereof, as seen in FIG. 3, with a cambar 202 to engage and close a switch 203. The switch 203, as seen inFIG. 7, is normally open and upon the said slide 36 reaching itsinnermost position actuates the movable contact 204 into contact withthe fixed contact 205 for thereby completing an electric circuit.

This electric circuit includes a wire 206 extending from the wire 195 ofthe main electrical circuit and which wire 206 terminates in the movablecontact 204. The fixed contact 205 has extending therefrom a wire 207having its other end con nected with oneend ofa solenoid coil 208 on thestem portion of the slide control valve stem 151, and which solenoidcoil 208 has connected with its other end a wire 209 terminating in thewire 196 of the main three wire system.

The energization of the solenoid coil 208 shifts the spool valve stem151 relative to the control valve sleeve 137 of the cross slide controlvalve 135 for thereby connecting the pipes or conduits 189 and 190 fromthe cylinder 99 with the cannelures 149 and 150 wherefore the pipe orconduit from the main pressure conduit 114 passes through the branch 171of the Y-member I70 and is connected with the pipe or conduit to thecylinder 99 ahead of the piston 101 for driving said piston outwardly,transversely, of the bed. This movement of thepiston 92 through thedepending arm 94 effects the said outward movement of the cross slide.This movement continues until the piston rod 97 engages the stop screw107 for thereby locking the said piston and slide in its outer inoperative position.

The hydraulic medium ahead of the piston 182 is ejected from thecylinder through the pipe or conduit 184 to the com trol valve 135 atwhich point the said pipe or conduit 184 is connected with the pipe orconduit I75 and therefore the sump 1 11.

At about this time the second cross slide, cross slide 37 has nowcompleted its work and whereupon substantially duplicate mechanism fromthat just described is brought into play for reversing the movement ofsaid cross slide 37. This mechanism is as follows:

At the inner end of the cross slide 37 is a switch 210 includ ing amovable contact 211 with which is connected one end of a wire 212 thathas its other end connected with wire 196 of the main electric system.The fixed contact 213 of the switch 210 has connected therewith one endof a wire 214 terminating in a solenoid coil 215 which has its coreprovided by a projecting end of the second slide control valve 136. Theother end of the solenoid coil 215 has connected therewith one end ofawire 216 which terminates at its other end in the wire 197 of the mainelectrical three'wire circuit.

The switch 210 is, again, adapted to be closed by the cross slide 37 foreffecting the shifting of the spool valve within the control valvesleeve 152 of the control valve 136 to again cause an outward,transverse, movement of the slide 37. This is effected through thecannelure 166 in the control valve 136 for connecting the hydraulicpressure ahead of the piston 101 and actuating said piston outwardly ofthe machine and ejecting the hydraulic medium ahead of it through thecannelurc 165, pipe or conduit 183 which empties into the pipe or conduit 178 and therefore the sump or tank 111.

It will be now noted that the machine tool has been put through acomplete cycle, namely, with the cross slides fully retracted, advancedto and through the work, and again fully retracted to their startingpositions. After the bar stock has been advanced to its proper positionwith its end engaged by the work stop 98 the manually operated startingswitch 199 is again pushed for effecting a second complete cycle.

Any suitable or desirable mechanism may be employed for advancing thebar stock after the severance or cutting off therefrom of the number ofportions, sleeves, slugs, or the like. and incorporated with thismechanism for operation thereby is an electric switch which wouldautomatically energize the circuit to the main control valve forelectrically exciting the sole noid coil of the main control valve andfor thereby automatically effecting a repeat of the cycle of operation.

From the foregoing it is now believed obvious that there has beenprovided a cutoff machine which among other important and specificobjects accomplishes the objects initially set forth above.

lclaim:

1. In a machine tool of the class described the combination of asupporting bed, means on said bed supporting a workpiece bar with an endaxially outwardly of said workpiece sup port, means on said bed rotatingsaid workpiece-bar-supporting means, said workpiece bar being adapted tohave portions of equal length cut from the present end thereof insuccession, a pair of slides each respectively mounted on the bed on upposite sides of the workpiece, a spindle on each slide, a toothedcircular saw cutter on each spindle and laterally of the workpiece andrespectively axially spaced from one another and from the end of theworkpiece bar, said toothed circular saw cutters being spaced axiallywith respect to one another and longitudinally of the axis of theworkpiece bar, whereby the toothed circular saw on the spindle nearestto the end of the workpiece bar will cut and completely sever the saidend of the workpiece bar prior to the cutting and complete severance ofthe second end of the workpiece bar by the second toothed circular sawcutter, means rotating each of said saw cutters, and meanssimultaneously actuating said rotating toothed circular saw cutterslides toward one another for effecting the said succession of the cutoff workpiece ends.

2, In a machine tool of the class described as set forth in claim 1characterized by, one of said rotating toothed circular saw cutterspindles having thereon a second toothed circular saw cutter spacedaxially of the workpiece bar a distance from the toothed circular sawcutter on the other spindle that the said toothed circular saw cutter onsaid second spindle is spaced from the first toothed circular sawcutter, and said second toothed circular saw cutter on the spindle beingof a diameter less than the first toothed circular saw cutter whereforeeach of the other toothed circular saw cutters removes its workpiece barend prior to the said removal of the bar end by the firstspindle-toothed circular saw cutter.

3. In a machine tool of the class described as set forth in claim 1characterized by, one of said rotating toothed circular saw cutterspindles having thereon a second toothed circular saw cutter spacedaxially of the workpiece bar a distance from the toothed circular sawcutter on the other spindle that the said toothed circular saw cutter onsaid second spindle is spaced from the first toothed circular sawcutter, said second toothed circular saw cutter on the spindle being ofa diameter less than the first toothed circular saw cutter whereforeeach of the other toothed circular saw cutters removes its workpiece barend prior to the said removal of the bar end by the first spindletoothed circular saw cutter, said means supporting the workpiece bar forrotation including a headstock on said bed having a hollow spindlecentrally of which the said workpiece bar extends, and means associatedwith said head stock and its hollow spindle for securing the workpiecebar to theheadstock spindle.

4. in a machine tool of the class described as set forth in claim 1characterized by, one of said rotating toothed circular saw cutterspindles having thereon a second toothed circular saw cutter spacedaxially of the workpiece bar a distance from the toothed circular sawcutter on the other spindle that the said toothed circular saw cutter onsaid second spindle is spaced from the first toothed circular sawcutter. said second toothed circular saw cutter on the spindle being ofa diameter less than the first toothed circular saw cutter whereforeeach of the other toothed circular saw cutters removes its workpiece barend prior to the said removal of the bar end by the first spindletoothed circular saw cutter, said means supporting the workpiece bar forrotation including a headstock on said bed having a hollow spindlecentrally of which the said workpiece bar extends, means associated withsaid headstock and its hollow spindle for securing the workpiece bar tothe headstock spindle, means automatically advancing the workpiece barthrough the headstock hollow spindle, and stop means limiting themovement of the workpiece bar relative to the spindle.

5. in a machine tool of the class described for cutting off the ends ofa metallic workpiece bar individually and in succession, the combinationof a supporting bed, means on said bcd supporting said metallicworkpiece bar with a portion thereof, freely, outwardly thereof, meanson said bed rotating said workpiece bar supporting means, said workpiecebar being adapted to have a plurality of portions thereof, each of anidentical length, removed inwardly of its end, in succession, a spindleadjacent the workpiece bar with its axis parallel to the axis of saidworkpiece bar, a pair of toothed circular saw cutters on the spindleeach having parallel sides at right angles to the spindle and workpiecebar axes, said successive saws inwardly from the workpiece bar end beingsuccessively smaller in diameter, means mounting said saw spindle andworkpiece bar support for relative feeding movement whereby successivetoothed circular saw cutters cuts from the end of the work piece barsuccessive end portions, a motor carried by the bed connected with thetoothed circular saw cutters spindle or the rotating workpiece barsupport, and said means connecting said motor with said movable spindleor workpiece-bar-rotat ing support including an extensible means forproviding a positive nonslip drive between said motor and the saidrotating workpiece bar support or toothed circular saw cutters spindleduring the relative movement of the saw spindle and workpiece barsupport.

6. In a machine tool of the class described as set forth in claim 5,characterized by, a second spindle having its axis parallel with andlaterally of the axis of the first spindle and on the side of theworkpiece bar opposite to that on which the first spindle is located, atoothed circular saw cutter on said second spindle, said toothedcircular saw cutter on said mounted on said second spindle with relationto said first spindle for movement toward and from the workpiece axisfor cutting off said portion of the workpiece bar inwardly of its endafter said first spindle first toothed circular saw cutter has cut itspiece.

7. In a machine tool of the class described as set forth in claim 5,characterized by, means on said bed and associated with said supportingmeans for said workpiece bar for axially advancing the workpiece barafter the removal therefrom of the workpiece bar ends, and stop meanspositioning said workpiece bar with respect to the toothed circularcutoffcuttcrs.

8, In a machine tool of the class described as set forth in claim 5,characterized by, a second spindle having its axis parallel with andlaterally ofthe axis ofthc first spindle and on the side of theworkpiece bar opposite to that on which the first spindle is located, atoothed circular saw cutter on said second spindle, said toothedcircular saw cuttcr on said second spindle being carried therebyrelative to the toothed circular saw cutters on the first spindle to cutfrom the end of the workpiece bar a portion equal in length to theportion of the workpiece bar cut by the first toothed circular sawcutter on the first spindle, said toothed circular saw cutter beingmounted on said second spindle with relation to said first spindle formovement toward and from the workpiece axis for cutting off said portionof the workpiece bar inwardly of its end after said first spindle firsttoothed circular saw cutter has cut off its piece, means on said bed andassociated with said supporting means for said workpiece bar foradvancing same after the removal therefrom of the workpiece bar ends,and stop means positioning said workpiece bar with respect to thetoothed circular saw cutters.

9. In a machine tool of the class described as set forth in claim 5,characterized by, said means for mounting, at least, one of the sawspindle or workpiece bar support being in the form of a slide mounted onthe bed, and said means for moving said toothed circular saw andworkpiece bar support cffecting the movement of the slide relative tothe bed and rela tive to the toothed circular saw cutter and theworkpiece bar axes.

l0. ln a machine tool of the class described as set forth in claim 5,characterized by, said means for mounting, at least, one of the sawspindle and workpiece bar support being in the form of a slide mountedon the bed, and hydraulic fluid operated means including an hydraulicfluid under pressure for shifting the slide on the bed and relative tothe workpiece bar and the toothed circular saw cutter axes.

11. in a machine tool of the class described as set forth in claim 5,characterized by, a second spindle having its axis parallel with andlaterally of the axis of the first spindle and on the side of theworkpiece bar opposite to that on which the first spindle is located, atoothed circular saw cutter on said second spindle, said toothedcircular saw cutter on said second spindle being carried therebyrelative to the toothed circular saw cutters on the first spindle to cutfrom the end of the workpiece bar a portion equal in length of theportion of the workpiece bar cut by the first toothed circular sawcutter on the first spindle, said toothed circular saw cutter beingmounted on said second spindle with relation to said first spindle formovement toward and from the workpiece axis for cutting off said portionof the workpiece bar inwardly of its end after said first spindle firsttoothed circular saw cutter has cut its portion, each of said spindlesbeing mounted on a slide independently supported and operated on thebed, and means for effecting the said independent movement of the sawspindles slides toward the workpiece bar.

12 In a machine tool of the class described as set forth in claim 5,characterized by, a second spindle having its axis parallel with andlaterally of the axis of the first spindle and on the side of theworkpiece bar opposite to that on which the first spindle is located, atoothed circular saw cutter on said second spindle, said toothedcircular saw cutter on said second spindle being carried therebyrelative to the toothed circular saw cutters on the first spindle to cutfrom the end of the workpiece bar a portion equal in length to theportion of the workpiece bar cut by the first toothed circular sawcutter on the first spindle, said toothed circular saw cutter beingmounted on said second spindle with relation to said first spin dle formovement toward and from the workpiece axis for cutting off said portionof the workpiece bar inwardly of its end after said first spindle firsttoothed circular saw cutter has cut its portion, each of said spindlesbeing mounted on a slide independently supported and operated on thebed, and hydraulic fluid operated means including an hydraulic fluidunder pressure for shifting the slides on the bed and relative to theworkpiece bar and the toothed circular saw cutter axes.

13. in a machine tool of the class described as set forth in claim 5,characterized by, said means for mounting, at least, one of the sawspindle and workpiece bar support being in the form of a slide mountedon the bed, means for moving said slide relative to the bed and relativeto the toothed circular saw cutter and the workpiece bar axis, means onsaid bed and associated with said supporting means for said workpiecebar for advancing same after the removal therefrom of the workpiece barends, and stop means positioning said workpiece bar with respect to thetoothed circular saw cutters.

14. In a machine tool of the class described as set forth in claim 5,characterized by, a second spindle having its axis parallel with andlaterally of the axis of the first spindle and on the side of theworkpiece bar opposite to that on which the first spindle is located, atoothed circular saw cutt -r on said second spindle, said toothedcircular saw cutte on said second spindle being carried thereby relativeto th; toothed circular saw cutters on the first spindle to cut from heend of the workpiece bar a portion equal in length to the portion of theworkpiece bar cut by the first toothed circular saw cutter on the firstspindle, said toothed circular saw cutter being mounted on said secondspindle with relation to said first spindle for movement toward and fromthe workpiece axis for cutting off said portion of the workpiece barinwardly of its end after said first spindle first toothed circular sawcutter has cut its portion, each of said spindles being mounted on aslide independently supported and operated on the bed, means foreffecting the said independent movement of the sawspindles slides towardthe workpiece bar, means on said bed and associated with said supportingmeans for said workpiece bar for advancing same after the removaltherefrom of the workpiece bar ends, and stop means positioning saidworkpiece bar with respect to the toothed circular saw cutters.

15. In a machine tool of the class described for cutting off the end ofametallic workpiece bar the combination of a sup porting bed, means onsaid bed for supporting said metallic workpiece bar with a portionthereof, freely, outwardly of the supporting means and from which atleast two substantially equal length pieces are to be removed insuccession, means on said bed rotating said workpiece-bar-supportingmeans, a plu rality of toothed circular saw cutters supported on saidbed laterally of the workpiece bar for rotation about an axis parallelto the axis of the metallic workpiece bar, said toothed cir cular sawcutters each having parallel sides at right angles to the workpiece barand axis of said toothed circular saw cutters and, respectively, spacedinwardly of the end of the workpiece bar so that one toothed circularsaw cutter is spaced :1 distance corresponding to the desired length ofthe workpiece bar end to be cut off and the second toothed circular sawcutter spaced inwardly of the first toothed circular saw cutter adistance equal to the spacing of the said first toothed circular sawcutter from the end of the workpiece, said toothed circular saw cutterfrom the end of the workpiece, said toothed circular saw cutters eachhaving a diameter sufficient to pass through the workpiece bar from apoint on its periphery to a point to its axis sufficient to effect thecutoff of the workpiece bar end, means connected with the toothedcircular saw cuttcrs for rotating same with their respective sides atright angles to the axis ofthe workpiece bar, a slide on said bedbetween itself and one of the work piece bar support and rotatingtoothed circular saw cutter support for moving the same on the bedrelative to the other, means automatically shifting and advanc ing saidslide with its supported member relative to the other whereby theworkpiece bar has first one piece cut therefrom and then a second piececut therefrom, means connected with the automatically shiftable slideincluding the member sup ported thereby and comprising a motor remotefrom said rotating member, and extensible means between said motor andsaid member providing a positive nonslip drive during movement of thesaid slide and supported member toward and from the cutting offposition.

16. ln a machine tool of the class described for cutting off the end ofa metallic workpiece bar the combination of a supporting bed, aheadstock on said bed having a hollow spindle through which extends andbeing supported thereby is said workpiece bar with a given portionthereof freely, outwardly, of the supporting headstock hollow spindleand from which projecting portion of the workpiece bar, at least, twopieces are to be removed in succession, means on said bed for rotat ingsaid workpiece bar through the rotation of the hollow spindle, a toothedcircular saw cutter spindle supporting, at least, two toothed circularsaw cutters on said bed laterally of the workpiece bar and rotatableabout an axis parallel to the axis of the metallic workpiece bar, saidtoothed circular saw cutters each having parallel sides at right anglesto the workpiece bar and axis of the said toothed circular saw cuttersand, respectively, said toothed circular saw cutters spaced inwardlyfrom the end of the workpiece bar so that one toothed circular sawcutter is spaced a distance corresponding to a desired length of theworkpiece bar end to be cut off and the second toothed circular sawcutter spaced inwardly of the first toothed circular saw cutter adistance corresponding to the desired length of the workpiece bar leftafter the complctc severance of said first end portion, said toothedcircular saw cutters each having a dissimilar diameter but each having adiameter sufficient to pass through the workpiece bar from the point onsaid periphery to a point toward its axis sufficient to effect the cutotT of the workpiece bar end, a motor supported on said supporting bedconnected with the toothed circular saw cutters spindle for rotating thesaid saws with their respec tive sides at right angles to the workpiecebar, a slide on said bed between said bed and the toothed circular sawcutters spindle for moving the same on the bed relative thereto, saidtoothed circular saw cutter rotating motor including a drive shafthaving at its free end a universal joint, said toothed circular sawcutter spindle having at its end a universal joint, ex tendable meansbetween said universal joints providing a positive nonslip drive betweensaid motor and said cutters spindle whereby the toothed circular sawcutters are rotated through the rotation of their spindle, and meansautomatically shifting and advancing said slide with its supportedspindle relative to the motor whereby the workpiece bar has, first, onepiece completely cut therefrom and permitted by gravity to drop from itsoperative position, and then the second piece is completely cut from theworkpiece bar and permitted by gravity to drop from its position.

17. In a machine tool of the class described for cutting off the end ofa metallic workpiece bar as set forth in claim 16 characterized by,expansible 'means between said universal joints whereby rotation of thecircular saw cutter continues during the movement of the slide includinga rod from one of the universal'joints, a tube from the other universaljoint slidable on the rod during movement of the saw in a workpiececutoff direction, and a key and spline between the rod and tube topermit continued rotation of said circular saw cutter, during themovement toward and from the workpiece axis.

18. In a machine tool of the class described for cutting off the end ofa metallic workpiece bar as set forth in claim 16 characterized by,cxpansible means between said universal joints whereby rotation of thecircular saw cutter continues during the movement of the slide includinga rod from one of the universal joints, a tube from the other universaljoint slidable on the rod during movement of the saw in a workpiececutoff direction, and a key and spline between the rod and tube topermit continued rotation of said circular saw cutter, during themovement toward and from the workpiece axis, said means for feeding theslide having secured thereto a movable member, said bed having securedthereto a stationary member relative to which the slide and its sawsbearing spindle is moved, and means under power for effecting themovement of the movable member relative to the fixed'member.

19. in a machine tool of the class described for cutting off the end ofa metallic workpiece bar as set forth in claim 16 characterized by,expansible means between said universal joints whereby rotation of thecircular saw cutter continues during the movement of the slide includinga rod from one of the universal joints, a tube from the other universaljoint slidable on the rod during movement of the saw in a workpiececutoff direction, and a key and spline between the rod and tube topermit continued rotation of said circular saw cutter, during themovement toward and from the workpiece axis, said means forautomatically actuating the slide having secured thereto a movablemember, said bed having secured thereto a stationary member relative towhich the slide and its movable member is moved, and means adjustablelimiting the amount of movement of the slide moving means and thereforethe movement of the slide in the feeding direction laterally of theworkpiece bar.

20. In a machine tool of the class described for cutting off the end ofa metallic workpiece bar as set forth in claim lb characterized by,expansiblc means between said universal joints whereby rotation of thecircular saw cutter continues during the movement of the slide includinga rod from one of the universal joints, a tube from the other universaljoint slidable on the rod during movement ofthe saw in a workpiece cutoff direction, and a key and spline between the rod and tube to permitcontinued rotation ofsaid circular saw cutter, during the movementtoward and from the workpiece axis, said means for automaticallyactuating the slide having secured thereto a piston, a cylinder carriedby the bed enclosing the piston for movement relative to one another,and an hydraulic medium under pressure connected alternately withopposite sides of the piston for reciprocating the same within thecylinder and thereby reciprocating the slide 2l In a machine tool of theclass described for cutting off the end of a metallic workpiece bar asset forth in claim 16 characterized by, cxpansible means between saiduniversal joints whereby rotation of the circular saw cutter continuesduring the movement ofthc slide including a rod from one of theunivcrsaljoints, a tube from the other univcrsaljoint slida ble on therod during movement of the saw in a workpiece cutoff direction, and akey and spline between the rod and tube to permit continued rotation ofsaid circular saw cutter, during the movement toward and from theworkpiece axis, said means for automatically actuating the slide havingsecured thereto a piston, a cylinder carried by the bed enclosing thepiston for movement relative to one another, an hydraulic medium underpressure connected alternately with opposite sides of the piston forreciprocating the same within the cylinder and thereby reciprocating theslide, and means carried by the bed and adjustable relative thereto forstopping the movement ofthc slide in each direction

1. In a machine tool of the class described the combination of asupporting bed, means on said bed supporting a workpiece bar with an endaxially outwardly of said workpiece support, means on said bed rotatingsaid workpiece-bar-supporting means, said workpiece bar being adapted tohave portions of equal length cut from the present end thereof insuccession, a pair of slides each respectively mounted on the bed onopposite sides of the workpiece, a spindle on each slide, a toothedcircular saw cutter on each spindle and laterally of the workpiece andrespectively axially spaced from one another and from the end of theworkpiece bar, said toothed circular saw cutters being spaced axiallywith respect to one another and longitudinally of the axis of theworkpiece bar, whereby the toothed circular saw on the spindle nearestto the end of the workpiece bar will cut and completely sever the saidend of the workpiece bar prior to the cutting and complete severance ofthe second end of the workpiece bar by the second toothed circular sawcutter, means rotating each of said saw cutters, and meanssimultaneously actuating said rotating toothed circular saw cutterslides toward one another for effecting the said succession of the cutoff workpiece ends.
 2. In a machine tool of the class described as setforth in claim 1 characterized by, one of said rotating toothed circularsaw cutter spindles having thereon a second toothed circular saw cutterspaced axially of the workpiece bar a distance from the toothed circularsaw cutter on the other spindle that the said toothed circular sawcutter on said second spindle is spaced from the first toothed circularsaw cutter, and said second toothed circular saw cutter on the spindlebeing of a diameter less than the first toothed circular saw cutterwherefore each of the other toothed circular saw cutters removes itsworkpiece bar end prior to the said removal of the bar end by the firstspindle-toothed circular saw cutter.
 3. In a machine tool of the classdescribed as set forth in claim 1 characterized by, one of said rotatingtoothed circular saw cutter spindles having thereon a second toothedcircular saw cutter spaced axially of the workpiece bar a distance fromthe toothed circular saw cutter on the other spindle that the saidtoothed circular saw cutter on said second spindle is spaced from thefirst toothed circular saw cutter, said second toothed circular sawcutter on the spindle being of a diameter less than the first toothedcircular saw cutter wherefore each of the other toothed circular sawcutters removes its workpiece bar end prior to the said removal of thebar end by the first spindle toothed circular saw cutter, said meanssupporting the workpiece bar for rotation including a headstock on saidbed having a hollow spindle centrally of which the said workpiece barextends, and means associated with said headstock and its hollow spindlefor securing the workpiece bar to the headstock spindle.
 4. In a machinetool of the class described as set forth in claim 1 characterized by,one of said rotating toothed circular saw cutter spindles having thereona second toothed circular saw cutter spaced axially of the workpiece bara distance from the toothed circular saw cutter on the other spindlethat the said toothed circular saw cutter on said second spindle isspaced from the first toothed circular saw cutter, said second toothedcircular saw cutter on the spindle being of a diameter less than thefirst toothed circular saw cutter wherefore each of the other toothedcircular saw cutters removes its workpiece bar end prior to the saidremoval of the bar end by the first spindle toothed circular saw cutter,said means supporting the workpiece bar for rotation including aheadstock on said bed having a hollow spindle centrally of which thesaid workpiece bar extends, means associated with said headstock and itshollow spindle for securing the workpiece bar to the headstock spindle,means automatically advancing the workpiece bar through the headstockhollow spindle, and stop means limiting the movement of the workpiecebar relative to the spindle.
 5. In a machine tool of the class describedfor cutting off the ends of a metallic workpiece bar individually and insuccession, the combination of a supporting bed, means on said bedsupporting said metallic workpiece bar with a portion thereof, freely,outwardly thereof, means on said bed rotating said workpiece barsupporting means, said workpiece bar being adapted to have a pluralityof portions thereof, each of An identical length, removed inwardly ofits end, in succession, a spindle adjacent the workpiece bar with itsaxis parallel to the axis of said workpiece bar, a pair of toothedcircular saw cutters on the spindle each having parallel sides at rightangles to the spindle and workpiece bar axes, said successive sawsinwardly from the workpiece bar end being successively smaller indiameter, means mounting said saw spindle and workpiece bar support forrelative feeding movement whereby successive toothed circular sawcutters cuts from the end of the workpiece bar successive end portions,a motor carried by the bed connected with the toothed circular sawcutters spindle or the rotating workpiece bar support, and said meansconnecting said motor with said movable spindle orworkpiece-bar-rotating support including an extensible means forproviding a positive nonslip drive between said motor and the saidrotating workpiece bar support or toothed circular saw cutters spindleduring the relative movement of the saw spindle and workpiece barsupport.
 6. In a machine tool of the class described as set forth inclaim 5, characterized by, a second spindle having its axis parallelwith and laterally of the axis of the first spindle and on the side ofthe workpiece bar opposite to that on which the first spindle islocated, a toothed circular saw cutter on said second spindle, saidtoothed circular saw cutter on said second spindle being carried therebyrelative to the toothed circular saw cutters on the first spindle to cutfrom the end of the workpiece bar a portion equal in length to theportion of the workpiece bar cut by the first toothed circular sawcutters on the first spindle, and said toothed circular saw cutter beingmounted on said second spindle with relation to said first spindle formovement toward and from the workpiece axis for cutting off said portionof the workpiece bar inwardly of its end after said first spindle firsttoothed circular saw cutter has cut its piece.
 7. In a machine tool ofthe class described as set forth in claim 5, characterized by, means onsaid bed and associated with said supporting means for said workpiecebar for axially advancing the workpiece bar after the removal therefromof the workpiece bar ends, and stop means positioning said workpiece barwith respect to the toothed circular cutoff cutters.
 8. In a machinetool of the class described as set forth in claim 5, characterized by, asecond spindle having its axis parallel with and laterally of the axisof the first spindle and on the side of the workpiece bar opposite tothat on which the first spindle is located, a toothed circular sawcutter on said second spindle, said toothed circular saw cutter on saidsecond spindle being carried thereby relative to the toothed circularsaw cutters on the first spindle to cut from the end of the workpiecebar a portion equal in length to the portion of the workpiece bar cut bythe first toothed circular saw cutter on the first spindle, said toothedcircular saw cutter being mounted on said second spindle with relationto said first spindle for movement toward and from the workpiece axisfor cutting off said portion of the workpiece bar inwardly of its endafter said first spindle first toothed circular saw cutter has cut offits piece, means on said bed and associated with said supporting meansfor said workpiece bar for advancing same after the removal therefrom ofthe workpiece bar ends, and stop means positioning said workpiece barwith respect to the toothed circular saw cutters.
 9. In a machine toolof the class described as set forth in claim 5, characterized by, saidmeans for mounting, at least, one of the saw spindle or workpiece barsupport being in the form of a slide mounted on the bed, and said meansfor moving said toothed circular saw and workpiece bar support effectingthe movement of the slide relative to the bed and relative to thetoothed circular saw cutter and the workpiece bar axes.
 10. In a machinetool of The class described as set forth in claim 5, characterized by,said means for mounting, at least, one of the saw spindle and workpiecebar support being in the form of a slide mounted on the bed, andhydraulic fluid operated means including an hydraulic fluid underpressure for shifting the slide on the bed and relative to the workpiecebar and the toothed circular saw cutter axes.
 11. In a machine tool ofthe class described as set forth in claim 5, characterized by, a secondspindle having its axis parallel with and laterally of the axis of thefirst spindle and on the side of the workpiece bar opposite to that onwhich the first spindle is located, a toothed circular saw cutter onsaid second spindle, said toothed circular saw cutter on said secondspindle being carried thereby relative to the toothed circular sawcutters on the first spindle to cut from the end of the workpiece bar aportion equal in length to the portion of the workpiece bar cut by thefirst toothed circular saw cutter on the first spindle, said toothedcircular saw cutter being mounted on said second spindle with relationto said first spindle for movement toward and from the workpiece axisfor cutting off said portion of the workpiece bar inwardly of its endafter said first spindle first toothed circular saw cutter has cut itsportion, each of said spindles being mounted on a slide independentlysupported and operated on the bed, and means for effecting the saidindependent movement of the saw spindles slides toward the workpiece bar.
 12. In a machine tool of the class described as set forth in claim 5,characterized by, a second spindle having its axis parallel with andlaterally of the axis of the first spindle and on the side of theworkpiece bar opposite to that on which the first spindle is located, atoothed circular saw cutter on said second spindle, said toothedcircular saw cutter on said second spindle being carried therebyrelative to the toothed circular saw cutters on the first spindle to cutfrom the end of the workpiece bar a portion equal in length to theportion of the workpiece bar cut by the first toothed circular sawcutter on the first spindle, said toothed circular saw cutter beingmounted on said second spindle with relation to said first spindle formovement toward and from the workpiece axis for cutting off said portionof the workpiece bar inwardly of its end after said first spindle firsttoothed circular saw cutter has cut its portion, each of said spindlesbeing mounted on a slide independently supported and operated on thebed, and hydraulic fluid operated means including an hydraulic fluidunder pressure for shifting the slides on the bed and relative to theworkpiece bar and the toothed circular saw cutter axes.
 13. In a machinetool of the class described as set forth in claim 5, characterized by,said means for mounting, at least, one of the saw spindle and workpiecebar support being in the form of a slide mounted on the bed, means formoving said slide relative to the bed and relative to the toothedcircular saw cutter and the workpiece bar axis, means on said bed andassociated with said supporting means for said workpiece bar foradvancing same after the removal therefrom of the workpiece bar ends,and stop means positioning said workpiece bar with respect to thetoothed circular saw cutters.
 14. In a machine tool of the classdescribed as set forth in claim 5, characterized by, a second spindlehaving its axis parallel with and laterally of the axis of the firstspindle and on the side of the workpiece bar opposite to that on whichthe first spindle is located, a toothed circular saw cutter on saidsecond spindle, said toothed circular saw cutter on said second spindlebeing carried thereby relative to the toothed circular saw cutters onthe first spindle to cut from the end of the workpiece bar a portionequal in length to the portion of the workpiece bar cut by the firsttoothed circular saw cutter on the first spindle, said toothed circularsaw cutter bEing mounted on said second spindle with relation to saidfirst spindle for movement toward and from the workpiece axis forcutting off said portion of the workpiece bar inwardly of its end aftersaid first spindle first toothed circular saw cutter has cut itsportion, each of said spindles being mounted on a slide independentlysupported and operated on the bed, means for effecting the saidindependent movement of the saw spindles slides toward the workpiecebar, means on said bed and associated with said supporting means forsaid workpiece bar for advancing same after the removal therefrom of theworkpiece bar ends, and stop means positioning said workpiece bar withrespect to the toothed circular saw cutters.
 15. In a machine tool ofthe class described for cutting off the end of a metallic workpiece barthe combination of a supporting bed, means on said bed for supportingsaid metallic workpiece bar with a portion thereof, freely, outwardly ofthe supporting means and from which at least two substantially equallength pieces are to be removed in succession, means on said bedrotating said workpiece-bar-supporting means, a plurality of toothedcircular saw cutters supported on said bed laterally of the workpiecebar for rotation about an axis parallel to the axis of the metallicworkpiece bar, said toothed circular saw cutters each having parallelsides at right angles to the workpiece bar and axis of said toothedcircular saw cutters and, respectively, spaced inwardly of the end ofthe workpiece bar so that one toothed circular saw cutter is spaced adistance corresponding to the desired length of the workpiece bar end tobe cut off and the second toothed circular saw cutter spaced inwardly ofthe first toothed circular saw cutter a distance equal to the spacing ofthe said first toothed circular saw cutter from the end of theworkpiece, said toothed circular saw cutter from the end of theworkpiece, said toothed circular saw cutters each having a diametersufficient to pass through the workpiece bar from a point on itsperiphery to a point to its axis sufficient to effect the cutoff of theworkpiece bar end, means connected with the toothed circular saw cuttersfor rotating same with their respective sides at right angles to theaxis of the workpiece bar, a slide on said bed between itself and one ofthe workpiece bar support and rotating toothed circular saw cuttersupport for moving the same on the bed relative to the other, meansautomatically shifting and advancing said slide with its supportedmember relative to the other whereby the workpiece bar has first onepiece cut therefrom and then a second piece cut therefrom, meansconnected with the automatically shiftable slide including the membersupported thereby and comprising a motor remote from said rotatingmember, and extensible means between said motor and said memberproviding a positive nonslip drive during movement of the said slide andsupported member toward and from the cutting off position.
 16. In amachine tool of the class described for cutting off the end of ametallic workpiece bar the combination of a supporting bed, a headstockon said bed having a hollow spindle through which extends and beingsupported thereby is said workpiece bar with a given portion thereoffreely, outwardly, of the supporting headstock hollow spindle and fromwhich projecting portion of the workpiece bar, at least, two pieces areto be removed in succession, means on said bed for rotating saidworkpiece bar through the rotation of the hollow spindle, a toothedcircular saw cutter spindle supporting, at least, two toothed circularsaw cutters on said bed laterally of the workpiece bar and rotatableabout an axis parallel to the axis of the metallic workpiece bar, saidtoothed circular saw cutters each having parallel sides at right anglesto the workpiece bar and axis of the said toothed circular saw cuttersand, respectively, said toothed circular saw cutters spaced inwardlyfrom the end of the workpiece bar so that one tootheD circular sawcutter is spaced a distance corresponding to a desired length of theworkpiece bar end to be cut off and the second toothed circular sawcutter spaced inwardly of the first toothed circular saw cutter adistance corresponding to the desired length of the workpiece bar leftafter the complete severance of said first end portion, said toothedcircular saw cutters each having a dissimilar diameter but each having adiameter sufficient to pass through the workpiece bar from the point onsaid periphery to a point toward its axis sufficient to effect the cutoff of the workpiece bar end, a motor supported on said supporting bedconnected with the toothed circular saw cutters spindle for rotating thesaid saws with their respective sides at right angles to the workpiecebar, a slide on said bed between said bed and the toothed circular sawcutters spindle for moving the same on the bed relative thereto, saidtoothed circular saw cutter rotating motor including a drive shafthaving at its free end a universal joint, said toothed circular sawcutter spindle having at its end a universal joint, extendable meansbetween said universal joints providing a positive nonslip drive betweensaid motor and said cutters spindle whereby the toothed circular sawcutters are rotated through the rotation of their spindle, and meansautomatically shifting and advancing said slide with its supportedspindle relative to the motor whereby the workpiece bar has, first, onepiece completely cut therefrom and permitted by gravity to drop from itsoperative position, and then the second piece is completely cut from theworkpiece bar and permitted by gravity to drop from its position.
 17. Ina machine tool of the class described for cutting off the end of ametallic workpiece bar as set forth in claim 16 characterized by,expansible means between said universal joints whereby rotation of thecircular saw cutter continues during the movement of the slide includinga rod from one of the universal joints, a tube from the other universaljoint slidable on the rod during movement of the saw in a workpiececutoff direction, and a key and spline between the rod and tube topermit continued rotation of said circular saw cutter, during themovement toward and from the workpiece axis.
 18. In a machine tool ofthe class described for cutting off the end of a metallic workpiece baras set forth in claim 16 characterized by, expansible means between saiduniversal joints whereby rotation of the circular saw cutter continuesduring the movement of the slide including a rod from one of theuniversal joints, a tube from the other universal joint slidable on therod during movement of the saw in a workpiece cutoff direction, and akey and spline between the rod and tube to permit continued rotation ofsaid circular saw cutter, during the movement toward and from theworkpiece axis, said means for feeding the slide having secured theretoa movable member, said bed having secured thereto a stationary memberrelative to which the slide and its saws bearing spindle is moved, andmeans under power for effecting the movement of the movable memberrelative to the fixed member.
 19. In a machine tool of the classdescribed for cutting off the end of a metallic workpiece bar as setforth in claim 16 characterized by, expansible means between saiduniversal joints whereby rotation of the circular saw cutter continuesduring the movement of the slide including a rod from one of theuniversal joints, a tube from the other universal joint slidable on therod during movement of the saw in a workpiece cutoff direction, and akey and spline between the rod and tube to permit continued rotation ofsaid circular saw cutter, during the movement toward and from theworkpiece axis, said means for automatically actuating the slide havingsecured thereto a movable member, said bed having secured thereto astationary member relative to which the slide and its movable member ismoved, and means adjustably limiting the amount of moveMent of the slidemoving means and therefore the movement of the slide in the feedingdirection laterally of the workpiece bar.
 20. In a machine tool of theclass described for cutting off the end of a metallic workpiece bar asset forth in claim 16 characterized by, expansible means between saiduniversal joints whereby rotation of the circular saw cutter continuesduring the movement of the slide including a rod from one of theuniversal joints, a tube from the other universal joint slidable on therod during movement of the saw in a workpiece cutoff direction, and akey and spline between the rod and tube to permit continued rotation ofsaid circular saw cutter, during the movement toward and from theworkpiece axis, said means for automatically actuating the slide havingsecured thereto a piston, a cylinder carried by the bed enclosing thepiston for movement relative to one another, and an hydraulic mediumunder pressure connected alternately with opposite sides of the pistonfor reciprocating the same within the cylinder and thereby reciprocatingthe slide.
 21. In a machine tool of the class described for cutting offthe end of a metallic workpiece bar as set forth in claim 16characterized by, expansible means between said universal joints wherebyrotation of the circular saw cutter continues during the movement of theslide including a rod from one of the universal joints, a tube from theother universal joint slidable on the rod during movement of the saw ina workpiece cutoff direction, and a key and spline between the rod andtube to permit continued rotation of said circular saw cutter, duringthe movement toward and from the workpiece axis, said means forautomatically actuating the slide having secured thereto a piston, acylinder carried by the bed enclosing the piston for movement relativeto one another, an hydraulic medium under pressure connected alternatelywith opposite sides of the piston for reciprocating the same within thecylinder and thereby reciprocating the slide, and means carried by thebed and adjustable relative thereto for stopping the movement of theslide in each direction.